diff --git a/src/anthropic/lib/streaming/_messages.py b/src/anthropic/lib/streaming/_messages.py
index b6b5f538..b09eaac0 100644
--- a/src/anthropic/lib/streaming/_messages.py
+++ b/src/anthropic/lib/streaming/_messages.py
@@ -477,7 +477,14 @@ def accumulate_event(
                 json_buf += bytes(event.delta.partial_json, "utf-8")
 
                 if json_buf:
-                    content.input = from_json(json_buf, partial_mode=True)
+                    try:
+                        content.input = from_json(json_buf, partial_mode=True)
+                    except ValueError as e:
+                        raise ValueError(
+                            f"Unable to parse tool parameter JSON from model. "
+                            f"Please retry your request or adjust your prompt. "
+                            f"Error: {e}. JSON: {json_buf.decode('utf-8')}"
+                        ) from e
 
                 setattr(content, JSON_BUF_PROPERTY, json_buf)
         elif event.delta.type == "citations_delta":
diff --git a/src/anthropic/lib/tools/_beta_builtin_memory_tool.py b/src/anthropic/lib/tools/_beta_builtin_memory_tool.py
index c58d54a2..caeb80a9 100644
--- a/src/anthropic/lib/tools/_beta_builtin_memory_tool.py
+++ b/src/anthropic/lib/tools/_beta_builtin_memory_tool.py
@@ -166,21 +166,21 @@ class BetaAsyncAbstractMemoryTool(BetaAsyncBuiltinFunctionTool):
     Example usage:
 
     ```py
-    class MyMemoryTool(BetaAbstractMemoryTool):
-        def view(self, command: BetaMemoryTool20250818ViewCommand) -> BetaFunctionToolResultType:
+    class MyMemoryTool(BetaAsyncAbstractMemoryTool):
+        async def view(self, command: BetaMemoryTool20250818ViewCommand) -> BetaFunctionToolResultType:
             ...
             return "view result"
 
-        def create(self, command: BetaMemoryTool20250818CreateCommand) -> BetaFunctionToolResultType:
+        async def create(self, command: BetaMemoryTool20250818CreateCommand) -> BetaFunctionToolResultType:
             ...
             return "created successfully"
 
         # ... implement other abstract methods
 
 
-    client = Anthropic()
+    client = AsyncAnthropic()
     memory_tool = MyMemoryTool()
-    message = client.beta.messages.run_tools(
+    message = await client.beta.messages.run_tools(
         model="claude-sonnet-4-5",
         messages=[{"role": "user", "content": "Remember that I like coffee"}],
         tools=[memory_tool],